161897 has 4 divisors (see below), whose sum is σ = 168960. Its totient is φ = 154836.

The previous prime is 161881. The next prime is 161911. The reversal of 161897 is 798161.

161897 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 161897 - 2⁴ = 161881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161807) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3497 + ... + 3542.

It is an arithmetic number, because the mean of its divisors is an integer number (42240).

2¹⁶¹⁸⁹⁷ is an apocalyptic number.

It is an amenable number.

161897 is a deficient number, since it is larger than the sum of its proper divisors (7063).

161897 is an equidigital number, since it uses as much as digits as its factorization.

161897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7062.

The product of its digits is 3024, while the sum is 32.

The square root of 161897 is about 402.3642628266. The cubic root of 161897 is about 54.5020620380.

The spelling of 161897 in words is "one hundred sixty-one thousand, eight hundred ninety-seven".